She understood that while the murky water presented her with uncertainty, the black lines at the bottom of the pool that gave her complete certainty and comfort still remained. Even without complete transparency, Kari realized that there is a balance between certainty and uncertainty that makes it possible to find your way through unclear situations. The scene reveals that her independence has allowed her to feel comfortable with uncertainty because she knows she's in control. Kari’s reaction to change in this scene is a direct contrast to her persona throughout the rest of the story and that is why we believe is a crucial scene that demonstrates Kari’s transformation.
What the implications of the scene are for other characters
Kari’s ability to swim in the murky salt water is a symbol of her independence and newly discovered confidence. This final scene shows that Kari doesn’t need to dependent on a male figure - such as a husband or father - for support and/or guidance. The fact that there are no other characters in this scene shows how much she has changed because in the rest of the story she is never alone.
The importance of the scene to the